Year	% of total population
1960	3.27638442378167
1961	3.25854421270248
1962	3.25230360250838
1963	3.25055077637862
1964	3.24314599425785
1965	3.22781900298111
1966	3.20688132760967
1967	3.18059318236551
1968	3.15038379981258
1969	3.11946000952846
1970	3.08954837170241
1971	3.0591091233954
1972	3.02704260677489
1973	2.9932735738777
1974	2.96087455617887
1975	2.98521087339489
1976	3.05897120499074
1977	3.12572469095836
1978	3.18209267321021
1979	3.22207180341802
1980	3.2469249521571
1981	3.2580360607038
1982	3.25776892241773
1983	3.25490609769552
1984	3.26073732739438
1985	3.27900106046617
1986	3.30850994919243
1987	3.34914892323224
1988	3.34062735415821
1989	3.28261400249162
1990	3.23054503314115
1991	3.18406931071723
1992	3.14074113711273
1993	3.10135431435567
1994	3.06950337647671
1995	3.04609724193794
1996	3.03002593720674
1997	3.02028999471364
1998	3.01142721363131
1999	3.00368282472888
2000	2.99901978825924
2001	2.99707737572631
2002	2.99997542702664
2003	3.00545114571118
2004	3.01083923795879
2005	3.01653898223214
2006	3.02467980168362
2007	3.03693171851919
2008	3.05494090987693
2009	3.08169237502193
2010	3.11929482338192
2011	3.16825581244985
2012	3.23251424971878
2013	3.31426032711664
2014	3.40905710892487
2015	3.51737378605026
2016	3.63572415538965
2017	3.75704722275488
2018	3.88090800941503
2019	4.00678634004058
2020	4.117187885154
2021	4.19788379365142
2022	4.27078022089725
2023	4.37977956536457